//
//  StatusListViewModel.swift
//  Sina
//
//  Created by 王杰 on 15/11/16.
//  Copyright © 2015年 王杰. All rights reserved.
//

import UIKit
import AFNetworking
import SVProgressHUD
import SDWebImage
class StatusListViewModel: NSObject {

    class func loadData(since_id since_id:Int,max_id:Int, finished: (array: [Status]?) -> ()) {

        let urlString = "https://api.weibo.com/2/statuses/home_timeline.json"
        guard let token = UserAccountViewModel().token else {
            SVProgressHUD.showErrorWithStatus("您暂未登陆")
            return
        }
        
        var parameters = ["access_token": token]
        
        if since_id > 0 {
        
            parameters["since_id"] = "\(since_id)"
        }
        
        if max_id > 0 {
        //paramaters["max_id"] = "\(max_id)"
        parameters["max_id"] = "\(max_id - 1)"
        }
        NetworkTools.sharedTools.requestJsonDict(.GET, urlString: urlString, parmaters: parameters) { (result, error) -> () in
            if error != nil {
                //错误回调
                finished(array: nil)
                return
            }
            
            if let array = result!["statuses"] as? [[String : AnyObject]] {
                var list = [Status]()
                //遍历数组
                for item in array {
                    let s = Status(dict: item)
                    list.append(s)
                }
                //完成回调
//                finished(array: list)
                StatusListViewModel.cacheStatusImage(list,finished:finished)
            }
            
        }
    }
    
    private class func cacheStatusImage(array: [Status],finished: (array: [Status]?) -> ()) {
        
        if array.count == 0 {
        
            finished(array: nil)

            return
        }
        let  group = dispatch_group_create()
        
        for s in array {
        
            if let imageurls = s.pictureURLs {
            
            if imageurls.count != 1 {
                continue
            }
        
            for url in imageurls {
            
            dispatch_group_enter(group)
                
                SDWebImageManager.sharedManager().downloadImageWithURL(url, options: [], progress: nil, completed: { (_, _, _, _, _) -> Void in
                    
                    print("单张图片下载完成")
                    
                    //异步下载
                    
                    dispatch_group_leave(group)
                })
              
                }
            }
        }
        
        dispatch_group_notify(group, dispatch_get_main_queue()) { () -> Void in
            //在主线程完成回调
            print("所有的异步图片下载完成")
            finished(array: array)
        }
        
    }
}













